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Everything about Ultrafilter

Maximal proper filter

In the mathematical field of order theory, an ultrafilter on a given partially ordered set is a certain subset of namely a maximal filter on that is, a proper filter on that cannot be enlarged to a bigger proper filter on Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: UltrafilterA 5-minute orientation
  2. Skim a recent paper: Choice of Ultrafilter Affects Recovery Rate of BacteriophagesInfluential work since 2022
  3. Pick up a classic book: The theory of ultrafiltersThe most-reprinted book on the subject
  4. Read the landmark paper: Ultrafilter Membranes and Ultrafiltration.Cited 333 times
  5. Go sideways: Ultrafilter on a setA closely related topic
  6. Go sideways: Boolean prime ideal theoremA closely related topic

📖 Definitions

Noun A device that performs ultrafiltration.

Noun A proper filter which has a law of dichotomy for complements.

Noun A filter (subset of a poset) that is maximal as a set with respect to the definition of proper filter.

Verb To filter by ultrafiltration.

🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

Ranked by number of editions on Open Library, a rough measure of how lasting a book is.

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